Dutch Iris prefer temperate climates but will tolerate warmer conditions than tulips. They are reasonably hardy and will naturalise in the right conditions. Plant 10cm apart and 10cm deep. They are best planted in groups and will form clumps that can be separated after a few years. Water well from planting onwards to promote root growth. They make excellent cut flowers; cut when buds have begun to unfurl. Flower mid-late spring.